One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(17,18,21,23)(19,26,28,32)(20,22,29,25)(24,30,31,27)(1,3,4,7)(2,5,6,8)(10,13)(11,15)(14,16)(18,22)(20,29)(23,25)(24,26)(27,30)(31,32)(2,6)(5,8)(9,10)(11,16)(12,14)(13,15)(18,23)(22,25)(24,31)(26,32) involution — undirected(10,14)(13,16)(17,19,21,28)(18,24,23,31)(20,30,29,27)(22,26,25,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.